Variable-delivery alternating piston pump



Aug. 28, 1951 T. J. LESTER 2,565,360

' VARIABLE DELIVERY ALTERNATING PISTON PUMP Filed July 24, 1945 4 Sheets-Sheet 1 J 30- IS ,50 22 INVENTOR. THOMAS J. LESTER ATTORNEYS Aug. 28, 1951 T. J. LESTER 2,565,860

VARIABLE DELIVERY ALTERNATING PIISTON PUMP Filed July 24, 1945 4 Sheets-Sheet 2 INVEN THOMAS J. LESTE M QMJJ ATTORNEYS Aug. 28, 1951 T. J. LESTER 2,565,860

VARIABLE DELIVERY ALTERNATING PISTON PUMP Filed July 24, 1945 4 Sheets-Sheet 5 INVENTOR. moms J.LESTER M TQM ATTORNEYS Aug. 28, 1951 T. J. LESTER 2,565,360

VARIABLE DELIVERY ALTERNATING PISTON PUMP Filed July 24, 1945 4 Sheets-SheetA INVENTOR. THOMAS J. LESTER w qmz/ ATTORNEYS Patented Aug. 28, 1951 um 12s PAT Q L 1}; cl i s; (01. 193 120) Fg, 8 is' a trans maxi-"win; e

With such arrangement, the inner rotors and the outer rotors are connected to the control rings by respective links, and while the entire assemblage rotates with the drive shaft within the mounting ring or casing 3|, the latter is capable of being positioned more or: less eccentrically to-the axis of the drive shaft, the link connections permitting such relative position and having the eifect of accelerating and decelerating the rate of rela tive movement of the inner rotor pistons. As shown in Fig. 7, the housing 2 is of a'size to contain a larger number of sets of concentric rotors and control rings, five such sets being shown for illustration. And, again, the end member 3 has a fixed shaft 5' with respective passages for inlet and outlet of fluid, and ports is at appropriate points for each set, and again the drive shaft 5" is in axial alignment, and is mounted with relation to the fixed shaft by'suitable ball bearing 1', which may be held by an end cap 1". Again, there is secured to the drive-shaft 6' a sleeve 9', this being secured, as bysuitable keys It and collar member ill, to the drive shaft 5. 1 In effect, the collar Hi is integral with the drive shaft, being fastened thereto by suitable screws or the like, and an opening'l3 may be provided if desired for lubricant admission. On the sleeve 9 are inner rotors l2, five of these being shown, and surrounding each inner rotor is an outer rotor 25', these having radially extending arms 26'. Between each set of an inner and outer rotor is a separating plate 21, having a radially projecting lug 21a. In turn, surrounding each set of inner and outer rotors is a corresponding control ring 3, these being enclosed in the ring member 3|, The latter is inside carrier means 3 la which is in, fact the casing therefor and which has stems 32 33, projecting at diametrally opposite points, and preferably connected by pins 34 through lugs on extensions 35a. Stem 32' is provided with a screw-threaded bushing 35' which engages in the housing wall 2, and locknut 36 permits locking in desired position of adjustment. r

The inner rotors l2 and adjacent separating plates 21 are heldtogether by suitable means. as bolts or screws 39, Fig. 8, from the end collars therethrough. From, an external lug on each separating plate a link 38' pivotally connects to an internal lug on the corresponding control ring 30, such link being cut in section in Fig. 8, and from each radially projecting arm 26 of the outer rotors 25, a link 42' pivotally connects to an'interna-l lug on the same control ring. The links of the separating plates are spaced apart arcuately around the inner circumference of the control rings, and similarly the links of the outer rotors are spaced arcuately. Thus, each control link is connected to its'adjacent outer rotor separating plate and inner rotor assembly.

As readily'understood, with the drive shaft in operation, and fluid supplied through the feed inlet, the sleeve rotating about the fixed shaft successively ports for inlet and outlet communication with the chambers in the outer rotor, and the vane-pistons therein correspondingly forward the fluid. Thus, with five sets of pistonchamber rotors 25' and inner vane-piston rotors l2, Fig. 7, spaced around'the 360 of perimeter, a rapid succession of discharges of fluid is provided in each rotation; and at the instant with the parts and the positions shown, the first pair of rotors 25', I2, at the left is in the late stage of discharging fluid from the vane-piston through its port 18' into the inclined channel lead ng within to the discharge duct (in Fig. 7 the upper one); while the next set of rotors, advanced by 72, is in the first stage of taking in fluid from the feed inlet side; and the middle set of rotors as shown in the transverse section at Fig. 8 is in mid-position, taking in feed; and .the further two sets of rotors correspondingly are advanced in discharge stage. With such a close series of discharges, the output stream is freed from the marked pulsations which are characteristic of simpler unit pumps. By reason of the plurality of sets of such pumping elements, particularly smooth high pressure discharge may be had, and the device operates without vibration.

"The circumferential channels 2| in the outer surface of the fixed shaft communicating the in-' take and delivery passages with the ports in the form in Fig. 1, are arcuate, less than in extent, and the bores or passages in the vanepistons permit utilizing the full pumping stroke of the pistons and prevent throttling or partial closing of the ports near the end of stroke. By connecting the rotors to the eccentrically mounted control rings at arcuately spaced points, the movement of a piston is non-coincident in phase or out of phase with that of another, and the eccentric connection, which can be adjusted from zero to maximum, occasions a faster rate of travel of the pistons in the mid-portion of their stroke than near the ends, as detailed in my aforemen" tioned application Serial No. 468,370, issued as Patent No. 2,426,361, of which this application is a continuation in part and as to common subject matter.

Other modes of applying the principle of the invention may be employed, change being made as regards the details described, provided the features stated in any of the following claims or the equivalent of such be employed.

I therefore particularly. point out and distinctly claim as my invention I '1. In a pump, a housing, a plurality of sets of concentric rotary members, interfitting abutments on each set of said members forming arcuately shaped displacement chambers between the rotary members of each set, motion transmitting means surrounding and connected to the rotary members for accelerating and decelerating the rate of rotation of each one of said rotarymembers of each set with respect tothe other of said rotary members of the said set, and ad-, justing means therefor comprising diametrically attached stems projecting through th housing walls, one stem havingthreaded engagement with said housing and having locking means in association, and the other stem being smooth and axially slidable. k

2. In a pump, a plurality of sets of concentric rotary members,-interfitting abutments on each set of said members forming arcuately shaped displacement chambersand vane-pistons therein having arcuate bores for passage of fluid, and motion transmitting means surrounding and connected to the rotary members for accelerating and decelerating the rate of rotation of each one of said rotary members of each set with respect to the other of said rotary members of the same set, said motion transmitting means being connected to one of said sets at a point angularly removed from the point of connection to the other of said sets, whereby the movement of said rotary members of one setwith respect to each other are out of phase with-the correspondingmgvement of said rotary members of the other se aseasco 3-. In apump'; ahousing; inner-:rotors each hay.- ing-a plurality of pistons thereon, axiallyspaced from" each other, outer rotorsconcentric with said' inner-rotorsand having chambers for receiving said pistons', rotatable" rings-mounted sur rounding and' eccentrically of said rotors, and connecting arms" between saidinner rotor and said rings and between saidringsand-said outerrotors, said connectingarmsbeing connected-to said inner rotor at arcuately spaced'points where= by the cycle of alternating movement imparted to" one of saidpistons is non -o'oincid'ent with that of another' of said-pistons, andmeans con nected to said rings to adjusttheireccentricity andvary the capacity of the pump comprising diametrically attached stems projecting through thahousing walls, oneisa-id stem having threaded engagement with said housing and having looking means iniassociation, and the other stem being smooth and axially slidable.

4. In a pump, a housing, concentric rotors, driving means for imparting a relative oscillation to said rotors, arcuately shaped pistons carried by one of said rotors, arcuately shaped chain bers carried. by the other of said rotors for receiving saidpistons, a fixed shaftsupporting said. rotors, intake and deliverypassages within said shaft, and. passages in said pistons adapted to place said intake and delivery passages in 00111 munication with said chambers, said piston passages leading from the arcuate end of said pistons to, thearcuate mid-point thereof, and means projecting diametrically at both. sides through the housing for supporting andadjusting the eccentricity of the rotors in the. housing to vary the capacity of the pump, compri sing two stems, one having screw threaded engagement with the housingwall and having looking means in'association, and: the other, stemsbeing smooth and axially slidabler 5. In a pump, a housing, concentric rotors,

driving means for imparting a relative oscillation to said rotors, arcuately shaped pistons carried by one of said rotors, arcuately shaped chambers carried by the other of said rotors for receiving said pistons, a fixed shaft supporting said rotors, intake and delivery passages within said shaft, circumferentially disposed channels in the outer surface of said shaft, said channels communicating with said intake and delivery passages and. being of less than 180 circumferential extent, and passages in said pistons adapted to place said channels in communication with said chambers, said piston passages leading from the arcuate end of said pistons to the arcuate mid-point thereof, said driving means including means surrounding and carrying said rotors, and means for adjusting the relative oscillation of the rotors to thereby vary the capacity of the pump including diametrically attached stems from said means surrounding and carrying the rotors projecting through the housing, one stem being smooth and axially slidable and the other stem having screw-threaded engagement with the housing wall and being provided with locking means.

6. In a pump, a housing, concentric rotors, driving means for imparting a relative oscillation to said rotors, arcuately shaped pistons carried by one of said rotors, arcuately shaped chambers carried by the other of said rotors for receiving said pistons, a fixed shaft supporting said rotors, intake and delivery passages within said shaft, circumferentially disposed channels in the outer surface of said shaft, said channels communicating: with; said intake and delivery: passages, and

being: located on. diametrically opposite sides; of, said? shaft; for said intake and; delivery passages,

and passages: in. saidpistons adapted to place,-

tors-in the'housing'and thereby-vary the capacityof thepump; comprising two stems, one having screw threaded engagement with the housing wall and having locking means in association, and the other: stem being. smooth and axially slid'able.

7. In a device of the character described, a housing, a: plurality of concentric inner and outer rotors with coactiing pistons and chambers, a plurality of, rotatable control rings surrounding said rotors, a casing surrounding and. supporting said rings, andimeansfor adjusting; said; casing transversely to the axis of said rotors, said means including stems connected to said casing at diametrically opposite, points and guided in openings insaid housing, a screw-threaded bushing on one of said stems engaging thehousing, and: a. coactinglock nut for securing the casing in, desired, position, the other said stem being smooth for sliding axially.

8. In: a device of the character, described, a housing, a fixed shaft therein with axial bores for inlet and outlet-of: fluid, a drive. shaft in axial alignment; with said fixed. shafts, ports and, arcuate grooves connecting to said ports in said fixed shaft, a sleeveabout said fixed shaft having grooves and ports and being connected to said drive shaft, a plurality of inner rotors about said sleeve and being connected to said drive shaft and having arcuate piston projections, an outer rotor about each said inner rotor and having arcuate chambers for said pistons, separating plates between the assemblies of rotors and being connected to the inner rotors, a control ring surrounding each such assembly of inner and outer rotors, means mounting the control rings, stems extending from said means at diametrically opposite points and guided in openings in said housing for adjustment whereby to vary the eccentricity of the control rings to vary the capacity of the pump, one stem having threaded engagement with the housing wall, locking means coacting with said stem, and links connecting each said control ring with its facing outer rotor and with an adjacent separating plate, said links being arcuately spaced.

9. In a device of the character described, a housing, a fixed shaft therein with axial bores for inlet and outlet of fluid, a drive shaft in axial alignment with said fixed shaft, ports and arcuate grooves communicating with said ports on said fixed shaft, a sleeve about said fixed shaft having grooves and ports and being connected to said drive shaft, a plurality of inner rotors about said sleeve and being connected to said drive shaft and having arcuate piston projections, an outer rotor about each said inner rotor and having arcuate chambers for said pistons, separating plates between the assemblies of inner and outer rotors and being connected to the inner rotors, a control ring surrounding each such assembly of inner and outer rotors, a generally cylindrical casing surrounding said control rings, means mounting the control rings, stems connected to said means at diametrically opposite points and guided in openings in said housing for adjustment of the position of said casing to vary its eccentricity and thereby vary the capacity of the pump, including a bushing in screwthreaded engagement with the housing, and links connecting each said control ring with its adjacent outer rotor and with the adjacent separating plate, said links being arcuately spaced.

10. In a device of the character described, a housing, a fixed shaft therein with axial bores for inlet and outlet of fluid, a drive shaft in axial alignment with said fixed shaft, ports and arcuate grooves communicating with said ports on said fixed shaft, a sleeve about said fixed shaft having grooves and ports and being connected to said drive shaft, a plurality of inner rotors about said sleeve and having arcuate piston projections and being connected to said sleeve, an outerrotor about each said inner rotor and having arcuate chambers for said pistons, separating plates between the assemblies of inner and outer rotors and being connected to the inner rotors, a control ring surrounding each such assembly of inner and outer rotors, a casing surrounding said control rings, stems having pinned connections to said casing at diametrically opposite points and guided in openings in said housing, and one such stem being provided with a screw-threaded bushing engaging the housing wall and having a lock nut, whereby to vary the eccentricity of the casing and vary the capacity of the pump.

11. In a device of the character described, a housing, a fixed shaft therein with axial bores for inlet and outlet of fluid, a drive shaft in axial alignment with said fixed shaft, ports and arcuate grooves communicating with said ports on said fixed shaft, a sleeve about said fixed shaft having grooves and ports and being connected to said drive shaft, a pluralityof inner rotors about said sleeve and having arcuate piston projections, an outer rotor about each said inner rotor and having arcuate chambers for said pistons, separating plates between the assemblies of rotors and being connected to the inner rotors, means connecting the inner rotors to said sleeve, a control ring surrounding each such assembly of inner and outer rotors, whereby to vary the eccentricity of the casing and vary the capacity of the pump, and links connecting each said control ring with its adjacent outer rotor and with its adjacent separating plate, said links. being arcuately spaced.

THOMAS J. LESTER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Re.21,583 Bancroft Oct. 1, 1940 498,618 Boyd May 30, 1893 550,466 Westinghouse Nov. 26, 1895 1,013,139 Dittlinger Jan. 2, 1912 1,308,352 Green July 1, 1919 1,370,810 Hansen Mar. 8, 1921 1,583,379 Whipple May 4, 1926 2,096,074 Stevens Oct. 19, 1937 2,148,282 Stevens Feb. 21, 1939 2,149,143 Landenberger Feb. 28, 1939 2,426,361 Lester Aug. 26, 1947 FOREIGN PATENTS Number Country Date 541,344 France May 1, 1922 654,347 France Nov. 28, 1928 

